The blades of steam turbine are subjected to the action of high temperature and high pressure steam, so they bear large bending moment in work, and the moving blades in high-speed operation also bear high centrifugal force; The blades in the wet steam area, especially the last stage, have to undergo electrochemical corrosion and water droplet erosion, and the moving blades also have to bear very complex exciting forces. Therefore, the steel for blade shall meet the following requirements:

1. Have sufficient mechanical properties and creep resistance at room temperature and high temperature;

2. High anti vibration attenuation ability;

3. High organizational stability;

4. Good corrosion resistance and erosion resistance;

5. Good process performance.